Steam-pump.



K. STEVENS.

Patented Apr. 15, 1913.

4 SHEETSSHEBT 1.

COLUMBIA PLANOGRAPH (10., WASHINGTON, D: c.

L. K. STEVENS.

STEAM PUMP.

APPLIUATION FILED DEC. 29, 1911.

Patented Apr. 15, 1913.

4 SHEETS-SHEET 2.

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APPLICATION FILED DBO. 29, 1911. 1,058,804. Patented A r, 15, 1913.

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L. K. STEVENS.

L. K. STEVENS.

Patented Apr. 15, 1913.

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UNITED STATES PATENT OFFICE.

LEON K. STEVENS, OF NEW YORK, N. Y., ASSIGNOR TO M. T. DAVIDSON COMPANY, A

CORPORATION OF NEW YORK.

STEAM-PUMP.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed. December 29, 1911. Serial No. 668,396.

To all whom it may concern:

Be it known that I, LEON K. STEVENS, a citizen of the United States, and a resident of New York city, borough of Brooklyn, in the county of Kings'and State of New York, have invented certain new and useful Improvements in SteanrPumps, of which the following is a specification.

My invention relates to improvements in steam pumps and particularly to the valve operating parts.

The object of my invention is to provide a simplified valve construction which will be more durable and may be provided at small cost.

A further object is to provide a construction in which the parts subjected to the greatest wear may be removed and replaced with corresponding parts without any machine work being necessary and without the use of special tools.

A further object is to provide a construction which will work without lubrication other than that of the moisture contained in the steam.

Referring to the drawings which form a part of this specification, Figure 1 is a vertical, longitudinal, sectional View through the valve and steam cylinder portions of a pump and disclosing my invention. Fig. 2 is a cross sectional view on line 22 of Fig; 1. Fig. 3 is a vertical, sectional view through the rotating valve. Fig. 4 is a view, partly in section, on line 44 of Fig. 3. Figs. 5 and 6 disclose a modification of the construction set forth in the previous figures and disclosing the use of puppet valves in place of a rotating valve to perform the function of exhausting the steam from behind the ends of the valve pistons,

Fig. 5 being a section on lines 5-5 of Fig. 6. 1

20, indicates the usual steam cylinder casting of a steam pump; 21, the cylinder formed therein; 22, the yoke frame which connects the steam cylinder casting to the water cylinder casting.

23 is a removable casting containing the main steam valve cylinder 24 in which are located two pistons 25 and 26 respectively, which are connected with a slide valve 27 which is located between said pistons. Each of the pistons 24 and 25, is provided with a perforation 28 which establishes communication with the main steam chest or inlet passage 29 which perforations permit steam to pass from the chamber 29 through the pistons to the spaces formed at the outer ends of same, alternately, as the valve 27 is reciprocated, as will'be readily understood. The casting 23 is provided with the main steam ports 30 and 31 respectively which extend from the chamber 29 to the opposite ends of the cylinder 21 in the usual manner. Formed in the casting 23 is a cylindrical opening 32 which extends entirely through from side to side and is provided at one end with a cap 33 and an exhaust pipe 34, through which the exhaust steam flows when liberated from the cylinder 21. Fastened to the opposite side of the casting 23 is a ring 35 which is provided with a projecting portion 36 entering the opening 32 hereinafter referred to as the exhaust chamber.

Fitted in the ring 35 is a rotary valve 37 which I prefer to make in two segmental parts of approximately semicircular section and fitted to closely contact with the inner periphery of the ring 35. The upper one of said portions is provided with a port 38 which is adapted to register alternately with the ports 39' and 40 formed in the ring 35, which in turn communicate respectively with the passages 41 and 42 formed in the casting 23 and leading to the respective ends of the cylinder 24. The valve 37 when made in two halves as illustrated is provided with a bore 43 which extends entirely through one of the segments and about half way through the other one as illustrated in Fig. 3, and a spiral spring 44 is located in said bore, one end of which abuts the bottom thereof and the opposite end of which abuts a plug 45, which is screwed into a corresponding threaded portion on the opposite valve segment. By means of this plug, the tension of the spring may be adjusted so that the segments may be kept in close contact with their bearing. Each of the segments of the valve 37 is provided with a projection 46 which for the purpose of easy machining, I prefer to form in the arc of a circle as illustrated and which projections serve as abutments. The valve 37 is provided with perforations 4747, etc., to permit the exhaust steam from the chamber 32 to flow through them to the opposite face of the valve to balance the pressure exerted on the valve during the exhaust of the steam from the main cylinder. The ring 35 is provided with an annular flanged portion 48 against which one face of the valve 37 may abut to prevent the valve from slipping into the chamber 32. The valve 37 is also provided with a slot 49 through the bottom portion to permit any condensed water which may form behind the valve to flow int-o the chamber 32, where it may be carried out through the exhaust pipe 34.

A flanged casting 50 is fitted to the outer surface of the ring 35 and is provided with a bore 51 and a bearing 52. A rotatable shaft 53 is fitted in the bearing 52 and carries on its inner end a flange 54 which is fitted in the bore 51 and extending across the face of the flange 54, and formed preferably integrally therewith is a rectangular shaped projection 55, the opposite ends of which extend to the ends of the abutments 46 formed on the valve 37. The ring 35 is preferably fitted to the face of the casting 32 by a ground joint at 56 to insure that the ports which lead from the valve cylinder to the exhaust chamber are steam tight at this point. The flanged casting 50 and ring 35 are held to the casting 23 by bolts 5757,

' etc., which extend entirely through the cast- .ing 50 and ring and screw into the casting 23 as illustrated. A piston 58 is fitted in the main cylinder 21 and is provided with the usual piston rod 59, which extends through the stuffing box 60 and carries a cross head 61. Connected with and reciprocated by the cross head 61 and piston 59 is a side rod 62 illustrated in dotted lines in Fig. 1, which connects with a lever 63, which in turn is connected to the shaft 53. The lever 63 which is indicated in dotted lines in Fig. 1 is provided at one end with a slot 64 to permit the movement of the lever 63 to be varied depending on the pointat which the side rod 62 is connected with the lever, as will be readily understood.

Having described the construction of the form of my invention illustrated in Figs. 1 to 4, I will now describe the operation.

Assuming that steam is admitted through the inlet pipe 65 to the steam chamber 29, steam will flow through passages 28 in the pistons 25 and 26 respectively, thus balancing the same, and will also flow through passage 31 behind the piston 58 and force the latter to the opposite end of the cylinder.

In making its stroke the piston rod will transmit motion through the side rod 62 and lever 63 to the shaft 53 and will turn said shaft until the projecting abutment- 55 contacts with the end of the abutments 46. The valve will then begin to rotate and the port 38 will be carried around into communication with the port 40, thus opening a passage for the high pressure steam in the chamber 66 to exhaust from said chamber through said ports and valve to the exhaust chamber 32 and thence to the atmosphere. It is obvious, however, that the passages 28 may be formed in the walls of the cylinder 24 and lead to the opposite ends thereof, the function being simply to carry the steam behind the ends of the pistons. The high pressure steam at the opposite end of the piston 25 will then exert its force and force the valve 27 to the opposite end of the cylinder 24, thus permitting the steam to exhaust through the passage 31 under the valve 27 to the exhaust chamber 32 and admitting steam through the passage 30 to the opposite end of the piston 58 to reverse the stroke of said last named piston. The piston 58 on again reaching the end of its stroke, will bring the port 38 into open communication with the port 39 and passage 41, thus exhausting the steam from behind the piston 25 and permitting the steam behind the piston 26 to exert its pressure and move the valve 27 to the position shown in the drawing, admitting steam through the port 31 to the piston 58 and causing it to make its next stroke, as will be clearly understood.

It is obvious that if the ports 39 and 40 are located nearer together in the ring, the abutments may be made shorter and the travel of the rotating abutment 55 will move a greater distance before moving the valve 37. The distance which said ports are placed apart is predetermined and the other parts are made to correspond to transmit the movement in proper timed relation to accomplish the desired result.

The size of the perforations 28 in the pistons of the valve 27 are in practice made very small compared to the size of the outlet passages 41 and 42, their area being determined by the size of the cylinder 24 and the pressure of steam used for operating the pump. It is obvious that in case the valve 37 should become badly worn or injured in any way, that by simply removing the parts 57, the ring 35 and valve can be instantly removed and replaced by a new valve construction with very small trouble and in a short space of time.

Referring now to the construction illustrated in Figs. 5 and 6, the construction of the valve 27 and pistons and the arrangement of the ports in the casting 23 are the same as in the construction previously described, also the piston 58, piston rod 59, cross head 61, side rods 62, lever 63 and shaft 53. The difference in construction is entirely in the ring and form of the valves. The casting 50 is provided with the bore 51 and a flange 54 is carried by the shaft and formed integral therewith and the flange 54 is provided with an abutment lever 70, which is practically the same in form as the abutment lever 55 shown in Fig. 4, but I prefer to form the ends with a plane surface lying at an angle to the axis through the lever as illustrated at 7l71, etc. The ring 35 is provided with two recesses 7272 in the bottom of each of which is formed a valve seat 73 and a cylindrical passage 74 which extends through the ring to the inner surface thereof and communicates with the exhaust chamber 32. Fitted in each of these recesses 72 is a puppet valve 75., the stem of which is provided with grooves to permit the steam to travel from the recess 72 through the passage 74 to the chamber 32. The tops of the recesses are closed by screw plugs 76. Ports 77 and 78 communicate with the respective ports 41 and 42 in the casting 23. When steam is admitted to the cylinder 21 and the pump is operating, the movement of the lever 63 rocks the abutment lever 70 bringing its opposite ends alternately in contact with the valves controlling the communication between the passages 41 and 42, and lifting the said valves alternately to permit the steam to exhaust from the spaces behind the pistons 24 and 25, to the exhaust chamber 32, as will be readily understood. This form of valve construction is held to the casting 23 in the same way and is equally easy to remove and renew. The function performed by the modified construction is practically the same as that performed by the rotating valve 37 Many modifications will occur to those skilled in the art. It may be understood, therefore, that I do not wish to limit myself to the precise construction hereinbefore described but consider such modifications to be within the scope of my invention provided they meet the terms of the appended claims.

Having thus described my invention, I claim as new 1. In a steam pump, a main cylinder, a removable casting mounted thereon having a valve cylinder formed therein, two pistons mounted in said valve cylinder, a valve located between said pistons, said casting being provided with a steam inlet port, an exhaust port, and with passages leading from the outer ends of the pistons to the exhaust port, a removable ring attached to said casting and having a valve therein for controlling the steam through said passages, and rotary means for actuating said valve, said rotary means comprising an abutment having lost motion with reference to said valve.

2. A steam pump comprising a main cylinder, a removable casting mounted thereon having a valve cylinder formed therein, two pistons mounted in said valve cylinder, a valve located between said pistons, said casting being provided with a steam inlet port, an exhaust port and with passages leading from the outer ends of said pistons to the exhaust port, a rotary valve controlling said passages, said rotary valve comprising two segments and a duet located in said seg ments adapted to register with said passages, and means for rotating said valve to open and close said passages, substantially as set forth.

3. A steam pump comprising a main cylinder, a removable casting mounted thereon having a valve cylinder formed therein, two pistons mounted in said valve cylinder, a valve located between said pistons, said casting being provided with a steam inlet port and with passages leading from the outer ends of said pistons to an exhaust port, a rotary valve controlling said passages, said rotary valve comprising two segments, a spring located between said segments, a duct located in said segments adapted to register with said passages, and means for rotating said valve to open and close said passages, substantially as set forth.

4. A steam pump comprising a main cylinder, a removable casting mounted thereon having a valve cylinder formed therein, two pistons mounted in said valve cylinder, a valve located between said pistons, said casting being provided witha steam inlet port and with passages leading from the outer ends of said pistons to an exhaust port, a rotary valve controlling said exhaust passages, said rotary valve comprising two segments, each segment having a chamber formed therein, a spring located in said chambers and acting to force said segments apart, a duct located in said segments adapted to register with said exhaust passages, and means for rotating said valve to open and close said passages, substantially as set forth.

Signed at New York city, in the county of Kings and State of New York this 26th day of December A. D. 1911.

LEON 'K. STEVENS.

Witnesses:

M. T. DAVIDSON, NELLIE M. KING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

